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gerrit-public.fairphone.software / toolchain / llvm-project / e9a31c40b65ffe15af5360b765e2e232255f2b26 / . / llvm / docs / ReleaseNotes.html
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Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]7 <title>LLVM 3.0 Release Notes</title>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]10
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]11<h1>LLVM 3.0 Release Notes</h1>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]12
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]13<img align=right src="http://llvm.org/img/DragonSmall.png"
Gabor Greif27b166352010-04-22 10:21:43 +0000[diff] [blame]14 width="136" height="136" alt="LLVM Dragon Logo">
Chris Lattnerc871bac2010-03-17 04:02:39 +0000[diff] [blame]15
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]16<ol>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#intro">Introduction</a></li>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]18 <li><a href="#subproj">Sub-project Status Update</a></li>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]19 <li><a href="#externalproj">External Projects Using LLVM 3.0</a></li>
20 <li><a href="#whatsnew">What's New in LLVM 3.0?</a></li>
Chris Lattner77a51732004-04-30 22:17:12 +0000[diff] [blame]21 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Dan Gohmanad888912008-10-14 16:23:02 +0000[diff] [blame]22 <li><a href="#knownproblems">Known Problems</a></li>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]23 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]24</ol>
25
Chris Lattner020e1fc2004-05-23 21:07:27 +0000[diff] [blame]26<div class="doc_author">
NAKAMURA Takumica46f5a2011-04-09 02:13:37 +0000[diff] [blame]27 <p>Written by the <a href="http://llvm.org/">LLVM Team</a></p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]28</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]29
Chris Lattner17c170a2011-04-06 06:29:50 +0000[diff] [blame]30<!--
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]31<h1 style="color:red">These are in-progress notes for the upcoming LLVM 3.0
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]32release.<br>
33You may prefer the
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]34<a href="http://llvm.org/releases/2.9/docs/ReleaseNotes.html">LLVM 2.9
Dan Gohman62af9d22010-05-03 23:51:05 +0000[diff] [blame]35Release Notes</a>.</h1>
Chris Lattner17c170a2011-04-06 06:29:50 +0000[diff] [blame]36 -->
Jeffrey Yasskin0830b972010-01-28 01:14:43 +0000[diff] [blame]37
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]38<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]39<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]40 <a name="intro">Introduction</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]41</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]42<!-- *********************************************************************** -->
43
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]44<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]45
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]46<p>This document contains the release notes for the LLVM Compiler
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]47 Infrastructure, release 3.0. Here we describe the status of LLVM, including
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]48 major improvements from the previous release, improvements in various
49 subprojects of LLVM, and some of the current users of the code.
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]50 All LLVM releases may be downloaded from
51 the <a href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
Chris Lattner62495762003-10-02 16:38:05 +0000[diff] [blame]52
Chris Lattnerb5bb5972004-12-07 08:04:13 +0000[diff] [blame]53<p>For more information about LLVM, including information about the latest
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]54 release, please check out the <a href="http://llvm.org/">main LLVM web
55 site</a>. If you have questions or comments,
56 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM
57 Developer's Mailing List</a> is a good place to send them.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]58
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]59<p>Note that if you are reading this file from a Subversion checkout or the main
60 LLVM web page, this document applies to the <i>next</i> release, not the
61 current one. To see the release notes for a specific release, please see the
62 <a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]63
64</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]65
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]66
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]67<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]68<h2>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]69 <a name="subproj">Sub-project Status Update</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]70</h2>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]71<!-- *********************************************************************** -->
Chris Lattner625a3d82008-06-08 21:34:41 +0000[diff] [blame]72
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]73<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]74
75<p>The LLVM 3.0 distribution currently consists of code from the core LLVM
76 repository (which roughly includes the LLVM optimizers, code generators and
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]77 supporting tools), and the Clang repository. In
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]78 addition to this code, the LLVM Project includes other sub-projects that are
79 in development. Here we include updates on these subprojects.</p>
Chris Lattnerf5cd9862008-10-13 18:01:01 +0000[diff] [blame]80
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]81<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]82<h3>
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]83<a name="clang">Clang: C/C++/Objective-C Frontend Toolkit</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]84</h3>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]85
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]86<div>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]87
Chris Lattner5de7f6e2010-04-26 17:42:18 +0000[diff] [blame]88<p><a href="http://clang.llvm.org/">Clang</a> is an LLVM front end for the C,
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]89 C++, and Objective-C languages. Clang aims to provide a better user
90 experience through expressive diagnostics, a high level of conformance to
91 language standards, fast compilation, and low memory use. Like LLVM, Clang
92 provides a modular, library-based architecture that makes it suitable for
93 creating or integrating with other development tools. Clang is considered a
94 production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]95 (32- and 64-bit), and for Darwin/ARM targets.</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]96
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]97<p>In the LLVM 3.0 time-frame, the Clang team has made many improvements:</p>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]98
99<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]100 <li>Greatly improved support for building C++ applications, with greater
101 stability and better diagnostics.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]102
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]103 <li><a href="http://clang.llvm.org/cxx_status.html">Improved support</a> for
104 the <a href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=50372">C++
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]105 2011</a> standard (aka "C++'0x"), including implementations of non-static data member
106 initializers, alias templates, delegating constructors, range-based
107 for loops, and implicitly-generated move constructors and move assignment
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]108 operators, among others.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]109
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]110 <li>Implemented support for some features of the upcoming C1x standard,
111 including static assertions and generic selections.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]112
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]113 <li>Better detection of include and linking paths for system headers and
114 libraries, especially for Linux distributions.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]115
David Chisnall07618782011-11-26 10:56:17 +0000[diff] [blame]116 <li>Several improvements to Objective-C support, including:
117
118 <ul>
119 <li><a href="http://clang.llvm.org/docs/AutomaticReferenceCounting.html">
120 Automatic Reference Counting</a> (ARC) and an improved memory model
121 cleanly separating object and C memory.</li>
122
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]123 <li>A migration tool for moving manual retain/release code to ARC</li>
David Chisnall07618782011-11-26 10:56:17 +0000[diff] [blame]124
125 <li>Better support for data hiding, allowing instance variables to be
126 declared in implementation contexts or class extensions</li>
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]127 <li>Weak linking support for Objective-C classes</li>
David Chisnall07618782011-11-26 10:56:17 +0000[diff] [blame]128 <li>Improved static type checking by inferring the return type of methods
129 such as +alloc and -init.</li>
130 </ul>
131
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]132 Some new Objective-C features require either the Mac OS X 10.7 / iOS 5
133 Objective-C runtime, or version 1.6 or later of the GNUstep Objective-C
134 runtime version.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]135
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]136 <li>Implemented a number of optimizations in <tt>libclang</tt>, the Clang C
137 interface, to improve the performance of code completion and the mapping
138 from source locations to abstract syntax tree nodes.</li>
Douglas Gregor936c75b2011-10-15 00:48:01 +0000[diff] [blame]139</ul>
140
Chris Lattnerfd97b882011-04-05 07:19:28 +0000[diff] [blame]141
Duncan Sandsce5d9ae2011-04-06 08:07:40 +0000[diff] [blame]142<p>If Clang rejects your code but another compiler accepts it, please take a
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]143 look at the <a href="http://clang.llvm.org/compatibility.html">language
144 compatibility</a> guide to make sure this is not intentional or a known
145 issue.</p>
Bill Wendlingef362462008-10-27 09:27:33 +0000[diff] [blame]146
Chris Lattner44c09cd2008-10-13 18:11:54 +0000[diff] [blame]147</div>
148
149<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]150<h3>
Duncan Sands1cd78982011-04-04 11:09:08 +0000[diff] [blame]151<a name="dragonegg">DragonEgg: GCC front-ends, LLVM back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]152</h3>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]153
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]154<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]155<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
156 <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
Duncan Sandsa294c542011-11-10 18:44:29 +0000[diff] [blame]157 optimizers and code generators with LLVM's. It works with gcc-4.5 or gcc-4.6,
158 targets the x86-32 and x86-64 processor families, and has been successfully
159 used on the Darwin, FreeBSD, KFreeBSD, Linux and OpenBSD platforms. It fully
160 supports Ada, C, C++ and Fortran. It has partial support for Go, Java, Obj-C
161 and Obj-C++.</p>
Duncan Sands92452b92010-04-02 09:23:15 +0000[diff] [blame]162
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]163<p>The 3.0 release has the following notable changes:</p>
164
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]165 <ul>
Duncan Sandsa294c542011-11-10 18:44:29 +0000[diff] [blame]166 <li>GCC version 4.6 is now fully supported.</li>
167
168 <li>Patching and building GCC is no longer required: the plugin should work
169 with your system GCC (version 4.5 or 4.6; on Debian/Ubuntu systems the
170 gcc-4.5-plugin-dev or gcc-4.6-plugin-dev package is also needed).</li>
171
172 <li>The <tt>-fplugin-arg-dragonegg-enable-gcc-optzns</tt> option, which runs
173 GCC's optimizers as well as LLVM's, now works much better. This is the
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]174 option to use if you want ultimate performance! It is still experimental
175 though: it may cause the plugin to crash.</li>
Duncan Sandsa294c542011-11-10 18:44:29 +0000[diff] [blame]176
177 <li>The type and constant conversion logic has been almost entirely rewritten,
178 fixing a multitude of obscure bugs.</li>
179
Duncan Sands7f9a0dc2010-09-30 17:37:34 +0000[diff] [blame]180</ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]181
182</div>
183
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]184<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]185<h3>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]186<a name="compiler-rt">compiler-rt: Compiler Runtime Library</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]187</h3>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]188
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]189<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]190
191<p>The new LLVM <a href="http://compiler-rt.llvm.org/">compiler-rt project</a>
192 is a simple library that provides an implementation of the low-level
193 target-specific hooks required by code generation and other runtime
194 components. For example, when compiling for a 32-bit target, converting a
195 double to a 64-bit unsigned integer is compiled into a runtime call to the
196 "__fixunsdfdi" function. The compiler-rt library provides highly optimized
197 implementations of this and other low-level routines (some are 3x faster than
198 the equivalent libgcc routines).</p>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]199
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]200<p>In the LLVM 3.0 timeframe, the target specific ARM code has converted to
201 "unified" assembly syntax, and several new functions have been added to the
202 library.</p>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]203
204</div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]205
206<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]207<h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]208<a name="lldb">LLDB: Low Level Debugger</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]209</h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]210
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]211<div>
Chris Lattnere9a31c42011-11-27 18:53:41 +0000[diff] [blame^]212
213<p>LLDB is a ground-up implementation of a command line debugger, as well as a
214 debugger API that can be used from other applications. LLDB makes use of the
215 Clang parser to provide high-fidelity expression parsing (particularly for
216 C++) and uses the LLVM JIT for target support.</p>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]217
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]218<p>LLDB has advanced by leaps and bounds in the 3.0 timeframe. It is
219 dramatically more stable and useful, and includes both a
220 new <a href="http://lldb.llvm.org/tutorial.html">tutorial</a> and
221 a <a href="http://lldb.llvm.org/lldb-gdb.html">side-by-side comparison with
222 GDB</a>.</p>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]223
224</div>
225
226<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]227<h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]228<a name="libc++">libc++: C++ Standard Library</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]229</h3>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]230
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]231<div>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]232
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]233<p>Like compiler_rt, libc++ is now <a href="DeveloperPolicy.html#license">dual
234 licensed</a> under the MIT and UIUC license, allowing it to be used more
235 permissively.</p>
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]236
David Chisnall07618782011-11-26 10:56:17 +0000[diff] [blame]237<p>Libc++ has been ported to FreeBSD and imported into the base system. It is
238 planned to be the default STL implementation for FreeBSD 10.</p>
239
Chris Lattner342f9572010-09-29 05:30:03 +0000[diff] [blame]240</div>
241
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]242<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]243<h3>
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]244<a name="vmkit">VMKit</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]245</h3>
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]246
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]247<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]248
Nicolas Geoffray5e515792011-11-10 23:37:56 +0000[diff] [blame]249 <p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
250 implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
251 static and just-in-time compilation.
252
253 <p>In the LLVM 3.0 time-frame, VMKit has had significant improvements on both
254 runtime and startup performance:</p>
255
256 <ul>
257 <li>Precompilation: by compiling ahead of time a small subset of Java's core
258 library, the startup performance have been highly optimized to the point that
259 running a 'Hello World' program takes less than 30 milliseconds.</li>
260
261 <li>Customization: by customizing virtual methods for individual classes,
262 the VM can statically determine the target of a virtual call, and decide to
263 inline it.</li>
264
265 <li>Inlining: the VM does more inlining than it did before, by allowing more
266 bytecode instructions to be inlined, and thanks to customization. It also
267 inlines GC barriers, and object allocations.</li>
268
269 <li>New exception model: the generated code for a method that does not do
270 any try/catch is not penalized anymore by the eventuality of calling a
271 method that throws an exception. Instead, the method that throws the
272 exception jumps directly to the method that could catch it.</li>
273 </ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]274
Chris Lattnercaefe932011-04-07 03:08:22 +0000[diff] [blame]275</div>
276
Chris Lattnere9a31c42011-11-27 18:53:41 +0000[diff] [blame^]277
278<!--=========================================================================-->
279<h3>
280<a name="LLBrowse">LLBrowse: IR Browser</a>
281</h3>
282
283<div>
284
285<p><a href="http://llvm.org/svn/llvm-project/llbrowse/trunk/doc/LLBrowse.html">
286 LLBrowse</a> is an interactive viewer for LLVM modules. It can load any LLVM
287 module and displays its contents as an expandable tree view, facilitating an
288 easy way to inspect types, functions, global variables, or metadata nodes. It
289 is fully cross-platform, being based on the popular wxWidgets GUI
290 toolkit.</p>
291
292</div>
293
294
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]295<!--=========================================================================-->
Chris Lattner9ee0b012011-04-05 18:38:45 +0000[diff] [blame]296<!--
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]297<h3>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]298<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]299</h3>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]300
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]301<div>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]302<p>
303<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
304programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
305through the application and records state transitions that lead to fault
306states. This allows it to construct testcases that lead to faults and can even
307be used to verify some algorithms.
308</p>
309
Chris Lattner0d364302011-03-10 07:43:44 +0000[diff] [blame]310<p>UPDATE!</p>
Chris Lattner9ee0b012011-04-05 18:38:45 +0000[diff] [blame]311</div>-->
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]312
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]313</div>
Daniel Dunbar8fbd8aa2010-10-04 17:39:47 +0000[diff] [blame]314
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]315<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]316<h2>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]317 <a name="externalproj">External Open Source Projects Using LLVM 3.0</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]318</h2>
Chris Lattner53e06f92009-02-26 22:33:38 +0000[diff] [blame]319<!-- *********************************************************************** -->
320
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]321<div>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]322
323<p>An exciting aspect of LLVM is that it is used as an enabling technology for
324 a lot of other language and tools projects. This section lists some of the
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]325 projects that have already been updated to work with LLVM 3.0.</p>
Chris Lattner120804a2010-10-03 23:49:06 +0000[diff] [blame]326
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]327<!--=========================================================================-->
Bill Wendling0ed57472011-10-26 00:17:54 +0000[diff] [blame]328<h3>AddressSanitizer</h3>
329
330<div>
331
332<p><a href="http://code.google.com/p/address-sanitizer/">AddressSanitizer</a>
333 uses compiler instrumentation and a specialized malloc library to find C/C++
334 bugs such as use-after-free and out-of-bound accesses to heap, stack, and
335 globals. The key feature of the tool is speed: the average slowdown
336 introduced by AddressSanitizer is less than 2x.</p>
337
338</div>
339
340<!--=========================================================================-->
Bill Wendling3bb971b2011-10-26 00:14:36 +0000[diff] [blame]341<h3>ClamAV</h3>
342
343<div>
Bill Wendling99ba0b62011-10-25 01:01:42 +0000[diff] [blame]344
Bill Wendling3bb971b2011-10-26 00:14:36 +0000[diff] [blame]345<p><a href="http://www.clamav.net">Clam AntiVirus</a> is an open source (GPL)
346 anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail
347 gateways.</p>
348
349<p>Since version 0.96 it
350 has <a href="http://vrt-sourcefire.blogspot.com/2010/09/introduction-to-clamavs-low-level.html">bytecode
351 signatures</a> that allow writing detections for complex malware.</p>
352
353<p>It uses LLVM's JIT to speed up the execution of bytecode on X86, X86-64,
354 PPC32/64, falling back to its own interpreter otherwise. The git version was
355 updated to work with LLVM 3.0.</p>
356
357</div>
358
359<!--=========================================================================-->
Tobias Grosser8bee91f2011-11-14 09:09:26 +0000[diff] [blame]360<h3>clang_complete for VIM</h3>
361
362<div>
363
364<p><a href="https://github.com/Rip-Rip/clang_complete">clang_complete</a> is a
365 VIM plugin, that provides accurate C/C++ autocompletion using the clang front
366 end. The development version of clang complete, can directly use libclang
367 which can maintain a cache to speed up auto completion.</p>
368
369</div>
370
371<!--=========================================================================-->
Bill Wendling5ee37be2011-10-26 18:23:06 +0000[diff] [blame]372<h3>clReflect</h3>
373
374<div>
375
376<p><a href="https://bitbucket.org/dwilliamson/clreflect">clReflect</a> is a C++
377 parser that uses clang/LLVM to derive a light-weight reflection database
378 suitable for use in game development. It comes with a very simple runtime
379 library for loading and querying the database, requiring no external
380 dependencies (including CRT), and an additional utility library for object
381 management and serialisation.</p>
382
383</div>
384
385<!--=========================================================================-->
Bill Wendlingca8dc4a2011-10-29 01:10:01 +0000[diff] [blame]386<h3>Cling C++ Interpreter</h3>
387
388<div>
389
390<p><a href="http://cern.ch/cling">Cling</a> is an interactive compiler interface
391 (aka C++ interpreter). It uses LLVM's JIT and clang; it currently supports
392 C++ and C. It has a prompt interface, runs source files, calls into shared
393 libraries, prints the value of expressions, even does runtime lookup of
394 identifiers (dynamic scopes). And it just behaves like one would expect from
395 an interpreter.</p>
396
397</div>
398
399<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]400<h3>Crack Programming Language</h3>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]401
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]402<div>
Bill Wendlinged4cc442011-11-03 20:10:01 +0000[diff] [blame]403
404<p><a href="http://code.google.com/p/crack-language/">Crack</a> aims to provide
405 the ease of development of a scripting language with the performance of a
406 compiled language. The language derives concepts from C++, Java and Python,
407 incorporating object-oriented programming, operator overloading and strong
408 typing.</p>
409
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]410</div>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]411
412<!--=========================================================================-->
Bill Wendlingb33bd112011-11-08 05:22:54 +0000[diff] [blame]413<h3>Eero</h3>
414
415<div>
416
417<p><a href="http://eerolanguage.org/">Eero</a> is a fully
418 header-and-binary-compatible dialect of Objective-C 2.0, implemented with a
419 patched version of the Clang/LLVM compiler. It features a streamlined syntax,
420 Python-like indentation, and new operators, for improved readability and
421 reduced code clutter. It also has new features such as limited forms of
422 operator overloading and namespaces, and strict (type-and-operator-safe)
423 enumerations. It is inspired by languages such as Smalltalk, Python, and
424 Ruby.</p>
425
426</div>
427
428<!--=========================================================================-->
Chris Lattnere5b37be2011-11-25 20:28:16 +0000[diff] [blame]429<h3>FAUST Real-Time Audio Signal Processing Language</h3>
430
431<div>
432
433<p><a href="http://faust.grame.fr/">FAUST</a> is a compiled language for
434 real-time audio signal processing. The name FAUST stands for Functional
435 AUdio STream. Its programming model combines two approaches: functional
436 programming and block diagram composition. In addition with the C, C++, Java
437 output formats, the Faust compiler can now generate LLVM bitcode, and works
438 with LLVM 2.7-3.0.
439 </p>
440
441</div>
442
443<!--=========================================================================-->
Bill Wendling3bb93ad2011-10-26 00:09:55 +0000[diff] [blame]444<h3>Glasgow Haskell Compiler (GHC)</h3>
445
446<div>
447
448<p>GHC is an open source, state-of-the-art programming suite for Haskell, a
449 standard lazy functional programming language. It includes an optimizing
450 static compiler generating good code for a variety of platforms, together
451 with an interactive system for convenient, quick development.</p>
452
453<p>GHC 7.0 and onwards include an LLVM code generator, supporting LLVM 2.8 and
454 later. Since LLVM 2.9, GHC now includes experimental support for the ARM
455 platform with LLVM 3.0.</p>
456
457</div>
458
459<!--=========================================================================-->
Bill Wendling3e3968e2011-10-25 20:35:31 +0000[diff] [blame]460<h3>gwXscript</h3>
461
462<div>
463
464<p><a href="http://botwars.tk/gwscript/">gwXscript</a> is an object oriented,
Bill Wendlingc902d132011-10-26 04:24:15 +0000[diff] [blame]465 aspect oriented programming language which can create both executables (ELF,
Bill Wendling3e3968e2011-10-25 20:35:31 +0000[diff] [blame]466 EXE) and shared libraries (DLL, SO, DYNLIB). The compiler is implemented in
467 its own language and translates scripts into LLVM-IR which can be optimized
468 and translated into native code by the LLVM framework. Source code in
469 gwScript contains definitions that expand the namespaces. So you can build
470 your project and simply 'plug out' features by removing a file. The remaining
471 project does not leave scars since you directly separate concerns by the
472 'template' feature of gwX. It is also possible to add new features to a
473 project by just adding files and without editing the original project. This
474 language is used for example to create games or content management systems
475 that should be extendable.</p>
476
477<p>gwXscript is strongly typed and offers comfort with its native types string,
478 hash and array. You can easily write new libraries in gwXscript or native
479 code. gwXscript is type safe and users should not be able to crash your
480 program or execute malicious code except code that is eating CPU time.</p>
481
482</div>
483
484<!--=========================================================================-->
Bill Wendlinga2ae87b2011-10-26 22:55:18 +0000[diff] [blame]485<h3>include-what-you-use</h3>
486
487<div>
488
489<p><a href="http://code.google.com/p/include-what-you-use">include-what-you-use</a>
490 is a tool to ensure that a file directly <code>#include</code>s
491 all <code>.h</code> files that provide a symbol that the file uses. It also
492 removes superfluous <code>#include</code>s from source files.</p>
493
494</div>
495
496<!--=========================================================================-->
Bill Wendlingfc1935c2011-11-07 22:05:17 +0000[diff] [blame]497<h3>ispc: The Intel SPMD Program Compiler</h3>
498
499<div>
500
501<p><a href="http://ispc.github.com">ispc</a> is a compiler for "single program,
502 multiple data" (SPMD) programs. It compiles a C-based SPMD programming
503 language to run on the SIMD units of CPUs; it often delivers 5-6x speedups on
504 a single core of a CPU with an 8-wide SIMD unit compared to serial code,
505 while still providing a clean and easy-to-understand programming model. For
506 an introduction to the language and its performance,
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]507 see <a href="http://ispc.github.com/example.html">the walkthrough</a> of a short
Bill Wendlingfc1935c2011-11-07 22:05:17 +0000[diff] [blame]508 example program. ispc is licensed under the BSD license.</p>
509
510</div>
Chris Lattnerc3e4fdc2011-11-25 20:36:17 +0000[diff] [blame]511
512<!--=========================================================================-->
513<h3>The Julia Programming Language</h3>
514
515<div>
516
517<p><a href="http://github.com/JuliaLang/julia">Julia</a> is a high-level,
518 high-performance dynamic language for technical
519 computing. It provides a sophisticated compiler, distributed parallel
520 execution, numerical accuracy, and an extensive mathematical function
521 library. The compiler uses type inference to generate fast code
522 without any type declarations, and uses LLVM's optimization passes and
523 JIT compiler. The language is designed around multiple dispatch,
524 giving programs a large degree of flexibility. It is ready for use on many
525 kinds of problems.</p>
526</div>
Bill Wendlingfc1935c2011-11-07 22:05:17 +0000[diff] [blame]527
528<!--=========================================================================-->
Bill Wendling4d9c8e52011-10-26 18:20:54 +0000[diff] [blame]529<h3>LanguageKit and Pragmatic Smalltalk</h3>
530
531<div>
532
533<p><a href="http://etoileos.com/etoile/features/languagekit/">LanguageKit</a> is
534 a framework for implementing dynamic languages sharing an object model with
535 Objective-C. It provides static and JIT compilation using LLVM along with
536 its own interpreter. Pragmatic Smalltalk is a dialect of Smalltalk, built on
537 top of LanguageKit, that interfaces directly with Objective-C, sharing the
538 same object representation and message sending behaviour. These projects are
Benjamin Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]539 developed as part of the &Eacute;toil&eacute; desktop environment.</p>
Bill Wendling4d9c8e52011-10-26 18:20:54 +0000[diff] [blame]540
541</div>
542
543<!--=========================================================================-->
Bill Wendlingeda350d2011-11-01 04:08:23 +0000[diff] [blame]544<h3>LuaAV</h3>
545
546<div>
547
548<p><a href="http://lua-av.mat.ucsb.edu/blog/">LuaAV</a> is a real-time
549 audiovisual scripting environment based around the Lua language and a
550 collection of libraries for sound, graphics, and other media protocols. LuaAV
551 uses LLVM and Clang to JIT compile efficient user-defined audio synthesis
552 routines specified in a declarative syntax.</p>
553
554</div>
555
556<!--=========================================================================-->
Bill Wendlingfd9eb5732011-10-26 00:16:17 +0000[diff] [blame]557<h3>Mono</h3>
558
559<div>
560
561<p>An open source, cross-platform implementation of C# and the CLR that is
562 binary compatible with Microsoft.NET. Has an optional, dynamically-loaded
563 LLVM code generation backend in Mini, the JIT compiler.</p>
564
565<p>Note that we use a Git mirror of LLVM with some patches. See:
566 https://github.com/mono/llvm</p>
567
568</div>
569
570<!--=========================================================================-->
Tobias Grossercfa35952011-11-14 09:09:23 +0000[diff] [blame]571<h3>Polly</h3>
572
573<div>
574
575<p><a href="http://polly.grosser.es">Polly</a> is an advanced data-locality
576 optimizer and automatic parallelizer. It uses an advanced, mathematical
577 model to calculate detailed data dependency information which it uses to
578 optimize the loop structure of a program. Polly can speed up sequential code
579 by improving memory locality and consequently the cache use. Furthermore,
580 Polly is able to expose different kind of parallelism which it exploits by
581 introducing (basic) OpenMP and SIMD code. A mid-term goal of Polly is to
582 automatically create optimized GPU code.</p>
583
584</div>
585
586<!--=========================================================================-->
Bill Wendlinge8caad52011-10-25 20:37:45 +0000[diff] [blame]587<h3>Portable OpenCL (pocl)</h3>
588
589<div>
590
591<p>Portable OpenCL is an open source implementation of the OpenCL standard which
592 can be easily adapted for new targets. One of the goals of the project is
593 improving performance portability of OpenCL programs, avoiding the need for
594 target-dependent manual optimizations. A "native" target is included, which
595 allows running OpenCL kernels on the host (CPU).</p>
596
597</div>
598
599<!--=========================================================================-->
Bill Wendling58209292011-10-25 20:39:06 +0000[diff] [blame]600<h3>Pure</h3>
601
602<div>
603<p><a href="http://pure-lang.googlecode.com/">Pure</a> is an
604 algebraic/functional programming language based on term rewriting. Programs
605 are collections of equations which are used to evaluate expressions in a
606 symbolic fashion. The interpreter uses LLVM as a backend to JIT-compile Pure
607 programs to fast native code. Pure offers dynamic typing, eager and lazy
608 evaluation, lexical closures, a hygienic macro system (also based on term
609 rewriting), built-in list and matrix support (including list and matrix
610 comprehensions) and an easy-to-use interface to C and other programming
611 languages (including the ability to load LLVM bitcode modules, and inline C,
612 C++, Fortran and Faust code in Pure programs if the corresponding LLVM-enabled
613 compilers are installed).</p>
614
615<p>Pure version 0.48 has been tested and is known to work with LLVM 3.0
616 (and continues to work with older LLVM releases &gt;= 2.5).</p>
617
618</div>
619
620<!--=========================================================================-->
Bill Wendling97b889d2011-10-26 00:12:04 +0000[diff] [blame]621<h3>Renderscript</h3>
622
623<div>
624
625<p><a href="http://developer.android.com/guide/topics/renderscript/index.html">Renderscript</a>
626 is Android's advanced 3D graphics rendering and compute API. It provides a
627 portable C99-based language with extensions to facilitate common use cases
628 for enhancing graphics and thread level parallelism. The Renderscript
629 compiler frontend is based on Clang/LLVM. It emits a portable bitcode format
630 for the actual compiled script code, as well as reflects a Java interface for
631 developers to control the execution of the compiled bitcode. Executable
632 machine code is then generated from this bitcode by an LLVM backend on the
633 device. Renderscript is thus able to provide a mechanism by which Android
634 developers can improve performance of their applications while retaining
635 portability.</p>
636
637</div>
638
639<!--=========================================================================-->
Bill Wendlingbf72f2c2011-10-25 20:40:26 +0000[diff] [blame]640<h3>SAFECode</h3>
641
642<div>
643
644<p><a href="http://safecode.cs.illinois.edu">SAFECode</a> is a memory safe C/C++
645 compiler built using LLVM. It takes standard, unannotated C/C++ code,
646 analyzes the code to ensure that memory accesses and array indexing
647 operations are safe, and instruments the code with run-time checks when
648 safety cannot be proven statically. SAFECode can be used as a debugging aid
649 (like Valgrind) to find and repair memory safety bugs. It can also be used
650 to protect code from security attacks at run-time.</p>
651
652</div>
653
654<!--=========================================================================-->
Bill Wendling8fae82a2011-10-26 07:38:19 +0000[diff] [blame]655<h3>The Stupid D Compiler (SDC)</h3>
656
657<div>
658
659<p><a href="https://github.com/bhelyer/SDC">The Stupid D Compiler</a> is a
660 project seeking to write a self-hosting compiler for the D programming
661 language without using the frontend of the reference compiler (DMD).</p>
662
663</div>
664
665<!--=========================================================================-->
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]666<h3>TTA-based Co-design Environment (TCE)</h3>
667
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]668<div>
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]669
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]670<p>TCE is a toolset for designing application-specific processors (ASP) based on
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]671 the Transport triggered architecture (TTA). The toolset provides a complete
672 co-design flow from C/C++ programs down to synthesizable VHDL and parallel
673 program binaries. Processor customization points include the register files,
674 function units, supported operations, and the interconnection network.</p>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]675
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]676<p>TCE uses Clang and LLVM for C/C++ language support, target independent
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]677 optimizations and also for parts of code generation. It generates new
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]678 LLVM-based code generators "on the fly" for the designed TTA processors and
679 loads them in to the compiler backend as runtime libraries to avoid
Bill Wendling53aa7a82011-10-25 20:24:32 +0000[diff] [blame]680 per-target recompilation of larger parts of the compiler chain.</p>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]681
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]682</div>
Chris Lattnerae6a89a2011-04-06 01:13:49 +0000[diff] [blame]683
684<!--=========================================================================-->
Bill Wendlingae9aa352011-10-25 20:27:37 +0000[diff] [blame]685<h3>Tart Programming Language</h3>
686
687<div>
688
689<p><a href="http://code.google.com/p/tart/">Tart</a> is a general-purpose,
690 strongly typed programming language designed for application
691 developers. Strongly inspired by Python and C#, Tart focuses on practical
692 solutions for the professional software developer, while avoiding the clutter
693 and boilerplate of legacy languages like Java and C++. Although Tart is still
694 in development, the current implementation supports many features expected of
695 a modern programming language, such as garbage collection, powerful
696 bidirectional type inference, a greatly simplified syntax for template
697 metaprogramming, closures and function literals, reflection, operator
698 overloading, explicit mutability and immutability, and much more. Tart is
699 flexible enough to accommodate a broad range of programming styles and
700 philosophies, while maintaining a strong commitment to simplicity, minimalism
701 and elegance in design.</p>
702
703</div>
704
705<!--=========================================================================-->
Bill Wendlingfe845d52011-10-26 09:25:01 +0000[diff] [blame]706<h3>ThreadSanitizer</h3>
707
708<div>
709
710<p><a href="http://code.google.com/p/data-race-test/">ThreadSanitizer</a> is a
711 data race detector for (mostly) C and C++ code, available for Linux, Mac OS
712 and Windows. On different systems, we use binary instrumentation frameworks
Bill Wendlingedc20872011-10-29 01:11:15 +0000[diff] [blame]713 (Valgrind and Pin) as frontends that generate the program events for the race
714 detection algorithm. On Linux, there's an option of using LLVM-based
715 compile-time instrumentation.</p>
Bill Wendlingfe845d52011-10-26 09:25:01 +0000[diff] [blame]716
717</div>
718
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]719</div>
720
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]721<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]722<h2>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]723 <a name="whatsnew">What's New in LLVM 3.0?</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]724</h2>
Chris Lattnerc75fd522008-06-08 21:58:17 +0000[diff] [blame]725<!-- *********************************************************************** -->
726
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]727<div>
Chris Lattnerb7bc2aa2008-06-08 22:59:35 +0000[diff] [blame]728
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]729<p>This release includes a huge number of bug fixes, performance tweaks and
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]730 minor improvements. Some of the major improvements and new features are
731 listed in this section.</p>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]732
Chris Lattnera67df2d2010-04-22 06:28:20 +0000[diff] [blame]733<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]734<h3>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]735<a name="majorfeatures">Major New Features</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]736</h3>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]737
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]738<div>
Chris Lattnercdc44ed2008-02-06 18:00:06 +0000[diff] [blame]739
Chris Lattner25a77902011-11-27 18:47:37 +0000[diff] [blame]740 <!-- Features that need text if they're finished for 3.1:
741 ARM EHABI
742 combiner-aa?
743 strong phi elim
744 loop dependence analysis
745 CorrelatedValuePropagation
746 lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.1.
747 -->
748
Chris Lattner3dcdc292011-11-27 08:32:32 +0000[diff] [blame]749<p><b>llvm-gcc is gone</b>. LLVM's configure script doesn't depend on llvm-gcc anymore, clean layering.</p>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]750
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]751<p>LLVM 3.0 includes several major new capabilities:</p>
752
Chris Lattner92f21832011-11-15 22:13:27 +0000[diff] [blame]753<!-- Near dead:
754 Analysis/RegionInfo.h + Dom Frontiers
755 SparseBitVector: used in LiveVar.
Chris Lattner3dcdc292011-11-27 08:32:32 +0000[diff] [blame]756 llvm/lib/Archive - replace with lib object?
Chris Lattner92f21832011-11-15 22:13:27 +0000[diff] [blame]757 -->
758
759<!--
Chris Lattner74a3e00e2011-11-27 05:47:57 +0000[diff] [blame]760 Type system rewrite: http://blog.llvm.org/2011/11/llvm-30-type-system-rewrite.html
Chris Lattner92f21832011-11-15 22:13:27 +0000[diff] [blame]761 Better performance for Neon code in clang due to SRoA improvements.
762 New regalloc on by default. Lin scan going away in 3.1
763 PGO / builtin_expect improvements (summary needed)
764 Big EH rewrite.
765 AVX support, assembler, compiler and disassembler.
766 IndVar improvements: andy
767 PTX backend improvements: Justin
768 llvm-rtdyld & MC JIT: JimG
769 InstAliases now automatically used in the asmprinter where they are shorter.
770 Integrated assembler on by default for arm/thumb?
771 PostOrder Dominator frontiers were removed.
772 Line Profiling / gcov support
773 EH and debug information produced with CFI directives, yielding smaller executables: http://blog.mozilla.com/respindola/2011/05/12/cfi-directives/
774 X86-64 generates smaller and faster code at -O0 (fast isel improvements)
775 Better code generation for Cortex-A9
776 Many APIs take ArrayRef's now.
777 Pass manager extension API.
Chris Lattner74a3e00e2011-11-27 05:47:57 +0000[diff] [blame]778 ARM inline asm constraints implemented.
779 LangRef.html#fnattrs uwtable attribute for asynch unwind tables.
780 better performance for indirect gotos.
781 llvm.prefetch now takes a 4th argument that specifies whether the prefetch happens to the icache or dcache.
782 New PackedVector, TinyPtrVector class (see Programmer's Manual)
783 New nonlazybind function attribute.
784 ARC language specific optimizer (Transforms/ObjCARC) a decent example of language-specific transformation.
Chris Lattnerbc639292011-11-27 06:56:53 +0000[diff] [blame]785 LLVM 3.0 removes support for reading LLVM 2.8 and earlier files. Aim to maintain compatibility all the way back to 3.0 "forever".
Chris Lattner614d0392011-11-25 20:33:27 +0000[diff] [blame]786
Chris Lattner74a3e00e2011-11-27 05:47:57 +0000[diff] [blame]787 New llvm.expect intrinsic.
788 Table generated MC expansion logic for pseudo instructions that expand to multiple MC instructions through the PseudoInstExpansion class. (JimG)
789 New llvm.fma intrinsic.
790
791 Euro dev meeting and main one too.
Chris Lattnerd5bb9e62011-11-27 07:37:53 +0000[diff] [blame]792 New atomics instructions, "#i_fence" instruction, cmpxchg, atomicrmw too. What target support (X86/ARM)? Also 'atomic load/store'. See Atomics.html
Chris Lattner74a3e00e2011-11-27 05:47:57 +0000[diff] [blame]793 X86: inline assembler supports .code32 and .code64.
Chris Lattnerebed15e2011-11-27 06:24:49 +0000[diff] [blame]794 Exception handling rewrite: new landingpad and resume instruction. Unwind gone.
795 LowerSetJmp pass removed, unused.
Chris Lattner3dcdc292011-11-27 08:32:32 +0000[diff] [blame]796 llvm-objdump / dwarf parser library / llvm-dwarfdump (d0k)
797 object file parsing stuff and llvm-size (mspencer)
798 llvm-cov (devang)
Chris Lattnerebed15e2011-11-27 06:24:49 +0000[diff] [blame]799 Old arm disassembler replaced with a new one based on autogenerated encoding information from ARM .td files.
Chris Lattnerd5bb9e62011-11-27 07:37:53 +0000[diff] [blame]800 Frontend tests removed from llvm/test/Frontend* (was this completed for 3.0?)
801 Segmented stack support (X86 only?) Rafael and Sanjoy Das: docs/SegmentedStacks.html should be in CodeGen.html status table?
802 X86 backend support for NaCl (David Meyer / Nick L)
803 Codegen now supports vector "select" operations on vector comparisons, turning
804 them into various optimized code sequences (e.g. using the SSE4/AVX "blend"
805 instructions).
Chris Lattner3dcdc292011-11-27 08:32:32 +0000[diff] [blame]806 #line directives in integrated assembler
807 SSE domain fixing code enabled for AVX (Bruno/Jakob). Domain fixing pass is
808 now target independent (ExecutionDepsFix pass). (Jakob)
809 X86 backend synthesizes horizontal add/sub instructions from generic code.
810 returns_twice attribute (rafael)
811 Tablegen has been split into a library, clang tblgen pieces now live in clang.
812 The llvm version is now named llvm-tblgen instead of tblgen.
813 X86: Tons of encoding improvements and new instructions (e.g. Atom, Ivy Bridge,
814 and BMI instructions)
815 added to assembler and disassembler (Craig Topper)
816 data layout string can encode the natural alignment of the target's stack for better optimization (LangRef.html#datalayout)
Chris Lattner92f21832011-11-15 22:13:27 +0000[diff] [blame]817 -->
818
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]819<ul>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]820
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]821<!--
822<li></li>
823-->
Chris Lattner9ee0b012011-04-05 18:38:45 +0000[diff] [blame]824
Chris Lattner458e79f2008-02-10 08:18:42 +0000[diff] [blame]825</ul>
Chris Lattnerfd97b882011-04-05 07:19:28 +0000[diff] [blame]826
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]827</div>
828
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]829<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]830<h3>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]831<a name="coreimprovements">LLVM IR and Core Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]832</h3>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]833
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]834<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]835
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]836<p>LLVM IR has several new features for better support of new targets and that
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]837 expose new optimization opportunities:</p>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]838
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]839<p>One of the biggest changes is that 3.0 has a new exception handling
840 system. The old system used LLVM intrinsics to convey the exception handling
841 information to the code generator. It worked in most cases, but not
842 all. Inlining was especially difficult to get right. Also, the intrinsics
843 could be moved away from the <code>invoke</code> instruction, making it hard
844 to recover that information.</p>
845
846<p>The new EH system makes exception handling a first-class member of the IR. It
847 adds two new instructions:</p>
848
Chris Lattnerb7112222008-06-05 06:25:56 +0000[diff] [blame]849<ul>
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]850 <li><a href="LangRef.html#i_landingpad"><code>landingpad</code></a> &mdash;
851 this instruction defines a landing pad basic block. It contains all of the
852 information that's needed by the code generator. It's also required to be
853 the first non-PHI instruction in the landing pad. In addition, a landing
854 pad may be jumped to only by the unwind edge of an <code>invoke</code>
855 instruction.</li>
856
857 <li><a href="LangRef.html#i_resume"><code>resume</code></a> &mdash; this
858 instruction causes the current exception to resume traveling up the
859 stack. It replaces the <code>@llvm.eh.resume</code> intrinsic.</li>
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]860</ul>
Mikhail Glushenkov024f7cf2008-10-13 02:08:34 +0000[diff] [blame]861
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]862<p>Converting from the old EH API to the new EH API is rather simple, because a
863 lot of complexity has been removed. The two intrinsics,
864 <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code> have been
Benjamin Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]865 superseded by the <code>landingpad</code> instruction. Instead of generating
Bill Wendlingd535a6e2011-10-26 18:33:01 +0000[diff] [blame]866 a call to <code>@llvm.eh.exception</code> and <code>@llvm.eh.selector</code>:
867
868<div class="doc_code">
869<pre>
870Function *ExcIntr = Intrinsic::getDeclaration(TheModule,
871 Intrinsic::eh_exception);
872Function *SlctrIntr = Intrinsic::getDeclaration(TheModule,
873 Intrinsic::eh_selector);
874
875// The exception pointer.
876Value *ExnPtr = Builder.CreateCall(ExcIntr, "exc_ptr");
877
878std::vector&lt;Value*&gt; Args;
879Args.push_back(ExnPtr);
880Args.push_back(Builder.CreateBitCast(Personality,
881 Type::getInt8PtrTy(Context)));
882
883<i>// Add selector clauses to Args.</i>
884
885// The selector call.
886Builder.CreateCall(SlctrIntr, Args, "exc_sel");
887</pre>
888</div>
889
890<p>You should instead generate a <code>landingpad</code> instruction, that
891 returns an exception object and selector value:</p>
892
893<div class="doc_code">
894<pre>
895LandingPadInst *LPadInst =
896 Builder.CreateLandingPad(StructType::get(Int8PtrTy, Int32Ty, NULL),
897 Personality, 0);
898
899Value *LPadExn = Builder.CreateExtractValue(LPadInst, 0);
900Builder.CreateStore(LPadExn, getExceptionSlot());
901
902Value *LPadSel = Builder.CreateExtractValue(LPadInst, 1);
903Builder.CreateStore(LPadSel, getEHSelectorSlot());
904</pre>
905</div>
906
907<p>It's now trivial to add the individual clauses to the <code>landingpad</code>
908 instruction.</p>
909
910<div class="doc_code">
911<pre>
912<i><b>// Adding a catch clause</b></i>
913Constant *TypeInfo = getTypeInfo();
914LPadInst-&gt;addClause(TypeInfo);
915
916<i><b>// Adding a C++ catch-all</b></i>
917LPadInst-&gt;addClause(Constant::getNullValue(Builder.getInt8PtrTy()));
918
919<i><b>// Adding a cleanup</b></i>
920LPadInst-&gt;setCleanup(true);
921
922<i><b>// Adding a filter clause</b></i>
923std::vector&lt;Constant*&gt; TypeInfos;
924Constant *TypeInfo = getFilterTypeInfo();
925TypeInfos.push_back(Builder.CreateBitCast(TypeInfo, Builder.getInt8PtrTy()));
926
927ArrayType *FilterTy = ArrayType::get(Int8PtrTy, TypeInfos.size());
928LPadInst-&gt;addClause(ConstantArray::get(FilterTy, TypeInfos));
929</pre>
930</div>
931
932<p>Converting from using the <code>@llvm.eh.resume</code> intrinsic to
933 the <code>resume</code> instruction is trivial. It takes the exception
934 pointer and exception selector values returned by
935 the <code>landingpad</code> instruction:</p>
936
937<div class="doc_code">
938<pre>
939Type *UnwindDataTy = StructType::get(Builder.getInt8PtrTy(),
940 Builder.getInt32Ty(), NULL);
941Value *UnwindData = UndefValue::get(UnwindDataTy);
942Value *ExcPtr = Builder.CreateLoad(getExceptionObjSlot());
943Value *ExcSel = Builder.CreateLoad(getExceptionSelSlot());
944UnwindData = Builder.CreateInsertValue(UnwindData, ExcPtr, 0, "exc_ptr");
945UnwindData = Builder.CreateInsertValue(UnwindData, ExcSel, 1, "exc_sel");
946Builder.CreateResume(UnwindData);
947</pre>
948</div>
949
Chris Lattnerdd6acc02008-02-10 08:17:19 +0000[diff] [blame]950</div>
951
952<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]953<h3>
Andrew Trick6c0a11b2011-11-06 17:59:24 +0000[diff] [blame]954<a name="loopoptimization">Loop Optimization Improvements</a>
955</h3>
956
957<div>
958<p>The induction variable simplification pass in 3.0 only modifies
959 induction variables when profitable. Sign and zero extension
960 elimination, linear function test replacement, loop unrolling, and
961 other simplifications that require induction variable analysis have
962 been generalized so they no longer require loops to be rewritten in a
963 typically suboptimal form prior to optimization. This new design
964 preserves more IR level information, avoids undoing earlier loop
965 optimizations (particularly hand-optimized loops), and no longer
966 strongly depends on the code generator rewriting loops a second time
967 in a now optimal form--an intractable problem.</p>
968
969<p>The original behavior can be restored with -mllvm -enable-iv-rewrite;
970 however, support for this mode will be short lived. As such, bug
971 reports should be filed for any significant performance regressions
972 when moving from -mllvm -enable-iv-rewrite to the 3.0 default mode.</p>
973</div>
974
975<!--=========================================================================-->
976<h3>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]977<a name="optimizer">Optimizer Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]978</h3>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]979
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]980<div>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]981
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]982<p>In addition to a large array of minor performance tweaks and bug fixes, this
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]983 release includes a few major enhancements and additions to the
984 optimizers:</p>
Chris Lattner2b8a52e2008-02-10 07:46:44 +0000[diff] [blame]985
986<ul>
Benjamin Kramer8c8486d2011-11-26 11:14:54 +0000[diff] [blame]987<li>Information about <a href="BranchWeightMetadata.html">branch probability</a>
988 and basic block frequency is now available within LLVM, based on a
989 combination of static branch prediction heuristics and
990 <code>__builtin_expect</code> calls. That information is currently used for
991 register spill placement and if-conversion, with additional optimizations
992 planned for future releases. The same framework is intended for eventual
993 use with profile-guided optimization.</li>
Chris Lattner23e16b592011-04-06 05:50:04 +0000[diff] [blame]994</li>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]995
Chris Lattnerfcc65a72010-10-04 02:42:39 +0000[diff] [blame]996</ul>
997
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]998</div>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]999
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]1000<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1001<h3>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]1002<a name="mc">MC Level Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1003</h3>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]1004
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1005<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1006
1007<p>The LLVM Machine Code (aka MC) subsystem was created to solve a number of
1008 problems in the realm of assembly, disassembly, object file format handling,
1009 and a number of other related areas that CPU instruction-set level tools work
1010 in.</p>
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]1011
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]1012<ul>
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]1013 <li>The ELF object streamers are much more full featured.</li>
1014 <li>Target dependent relocation handling has been refactored into the Targets.</li>
1015 <li>Early stage MC-JIT infrastructure has been implemented.</li>
Chris Lattnerbf1cf672010-10-02 21:59:30 +0000[diff] [blame]1016</ul>
1017
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]1018<p>The MC-JIT is a major new feature for MC, and will eventually grow to replace
1019the current JIT implementation. It emits object files direct to memory and
1020uses a runtime dynamic linker to resolve references and drive lazy compilation.
1021The MC-JIT enables much greater code reuse between the JIT and the static
1022compiler and provides better integration with the platform ABI as a result.</p>
1023
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1024<p>For more information, please see
1025 the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro
1026 to the LLVM MC Project Blog Post</a>.</p>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]1027
NAKAMURA Takumi8d89b8e2011-04-05 08:24:22 +0000[diff] [blame]1028</div>
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]1029
Chris Lattnerf25bc192010-09-30 16:31:33 +0000[diff] [blame]1030<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1031<h3>
Chris Lattnerd434bfb2009-03-02 03:24:11 +0000[diff] [blame]1032<a name="codegen">Target Independent Code Generator Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1033</h3>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]1034
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1035<div>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]1036
Mikhail Glushenkov25422542009-03-01 18:09:47 +0000[diff] [blame]1037<p>We have put a significant amount of work into the code generator
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1038 infrastructure, which allows us to implement more aggressive algorithms and
1039 make it run faster:</p>
Chris Lattner7795ea92008-06-08 02:45:07 +0000[diff] [blame]1040
1041<ul>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]1042<!--
1043<li></li>
1044-->
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]1045</ul>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]1046</div>
1047
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]1048<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1049<h3>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]1050<a name="x86">X86-32 and X86-64 Target Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1051</h3>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]1052
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1053<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1054
1055<p>New features and major changes in the X86 target include:</p>
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]1056
1057<ul>
Benjamin Kramer8c8486d2011-11-26 11:14:54 +0000[diff] [blame]1058 <li>The X86 backend, assembler and disassembler now completely support AVX.
1059 To enable it pass <code>-mavx</code> to the compiler.</li>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1060
Chris Lattnerdfcdd0c2011-11-15 22:48:24 +0000[diff] [blame]1061 <li>The X86 backend now supports
1062 all <a href="http://llvm.org/PR879">inline assembly that uses the X86
1063 floating point stack</a>.</li>
1064
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1065 <li>The CRC32 intrinsics have been renamed. The intrinsics were previously
1066 <code>@llvm.x86.sse42.crc32.[8|16|32]</code>
1067 and <code>@llvm.x86.sse42.crc64.[8|64]</code>. They have been renamed to
1068 <code>@llvm.x86.sse42.crc32.32.[8|16|32]</code> and
1069 <code>@llvm.x86.sse42.crc32.64.[8|64]</code>.</li>
Chad Rosierd1db4f82011-05-27 20:13:10 +0000[diff] [blame]1070
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]1071</ul>
1072
Chris Lattnerd1094e02009-03-02 02:37:32 +0000[diff] [blame]1073</div>
Chris Lattner0a1fd102007-09-21 03:54:09 +0000[diff] [blame]1074
1075<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1076<h3>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1077<a name="ARM">ARM Target Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1078</h3>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]1079
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1080<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1081
1082<p>New features of the ARM target include:</p>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]1083
1084<ul>
Jim Grosbach651e2ee2011-11-24 00:49:21 +0000[diff] [blame]1085 <li>Reworked Set Jump Long Jump EH Lowering,</li>
1086 <li>improved support for Cortex-M series processors, and</li>
1087 <li>beta quality integrated assembler support.</li>
Bob Wilsone44f2982010-09-13 17:39:35 +0000[diff] [blame]1088</ul>
Chris Lattneraa61f412009-10-13 17:48:04 +0000[diff] [blame]1089</div>
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1090
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1091
1092<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1093<h3>
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1094<a name="MIPS">MIPS Target Improvements</a>
1095</h3>
1096
1097<div>
1098
1099<p>New features and major changes in the MIPS target include:</p>
1100
1101<ul>
1102 <li>Most MIPS32r1 and r2 instructions are now supported.</li>
1103 <li>LE/BE MIPS32r1/r2 has been tested extensively.</li>
1104 <li>O32 ABI has been fully tested.</li>
1105 <li>MIPS backend has migrated to using the MC infrastructure for assembly printing. Initial support for direct object code emission has been implemented too.</li>
1106 <li>Delay slot filler has been updated. Now it tries to fill delay slots with useful instructions instead of always filling them with NOPs.</li>
1107 <li>Support for old-style JIT is complete.</li>
1108 <li>Support for old architectures (MIPS1 and MIPS2) has been removed.</li>
1109 <li>Initial support for MIPS64 has been added.</li>
1110</ul>
1111</div>
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1112
1113<!--=========================================================================-->
1114<h3>
1115 <a name="PTX">PTX Target Improvements</a>
1116</h3>
1117
1118<div>
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1119
Chris Lattner212a0862011-11-15 22:23:46 +0000[diff] [blame]1120 <p>
1121 The PTX back-end is still experimental, but is fairly usable for compute kernels
1122 in LLVM 3.0. Most scalar arithmetic is implemented, as well as intrinsics to
1123 access the special PTX registers and sync instructions. The major missing
1124 pieces are texture/sampler support and some vector operations.</p>
1125
1126 <p>That said, the backend is already being used for domain-specific languages
1127 and works well with the <a href="http://www.pcc.me.uk/~peter/libclc/">libclc
1128 library</a> to supply OpenCL built-ins. With it, you can use Clang to compile
1129 OpenCL code into PTX and execute it by loading the resulting PTX as a binary
1130 blob using the nVidia OpenCL library. It has been tested with several OpenCL
1131 programs, including some from the nVidia GPU Computing SDK, and the performance
1132 is on par with the nVidia compiler.</p>
1133
1134</div>
1135
Akira Hatanakab89a58d2011-11-15 21:33:05 +0000[diff] [blame]1136<!--=========================================================================-->
1137<h3>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1138<a name="OtherTS">Other Target Specific Improvements</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1139</h3>
Chris Lattnerc92d7692009-03-01 02:30:21 +0000[diff] [blame]1140
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1141<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1142
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]1143 <p>PPC32/ELF va_arg was implemented.</p>
1144 <p>PPC32 initial support for .o file writing was implemented.</p>
Wesley Peck1c29a832011-11-14 18:56:41 +0000[diff] [blame]1145 <p>MicroBlaze scheduling itineraries were added that model the
1146 3-stage and the 5-stage pipeline architectures. The 3-stage
1147 pipeline model can be selected with <code>-mcpu=mblaze3</code>
1148 and the 5-stage pipeline model can be selected with
1149 <code>-mcpu=mblaze5</code>.</p>
Chris Lattner6d3eeec2011-11-10 20:15:40 +0000[diff] [blame]1150
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1151<ul>
Chad Rosier06da55e2011-05-27 22:50:46 +0000[diff] [blame]1152<!--
1153<li></li>
1154-->
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1155</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1156
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1157</div>
Chris Lattner6cb64032008-06-05 08:02:49 +0000[diff] [blame]1158
1159<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1160<h3>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1161<a name="changes">Major Changes and Removed Features</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1162</h3>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1163
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1164<div>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1165
Bill Wendling2d3138c2011-08-03 22:18:20 +0000[diff] [blame]1166<p>If you're already an LLVM user or developer with out-of-tree changes based on
1167 LLVM 2.9, this section lists some "gotchas" that you may run into upgrading
1168 from the previous release.</p>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1169
1170<ul>
Chris Lattner3dcdc292011-11-27 08:32:32 +0000[diff] [blame]1171 <li>The <code>LLVMC</code> meta compiler driver was removed.</li>
Jay Foad2755e072011-08-04 10:43:43 +0000[diff] [blame]1172 <li>The <code>LowerSetJmp</code> pass wasn't used effectively by any
1173 target and has been removed.</li>
Rafael Espindolaa45c20b2011-08-30 23:03:45 +0000[diff] [blame]1174 <li>The old <code>TailDup</code> pass was not used in the standard pipeline
1175 and was unable to update ssa form, so it has been removed.
Eli Friedman02e737b2011-08-12 22:50:01 +0000[diff] [blame]1176 <li>The syntax of volatile loads and stores in IR has been changed to
1177 "<code>load volatile</code>"/"<code>store volatile</code>". The old
1178 syntax ("<code>volatile load</code>"/"<code>volatile store</code>")
1179 is still accepted, but is now considered deprecated.</li>
Benjamin Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]1180 <li>The old atomic intrinsics (<code>llvm.memory.barrier</code> and
Eli Friedman2c25d9c2011-10-26 00:55:23 +0000[diff] [blame]1181 <code>llvm.atomic.*</code>) are now gone. Please use the new atomic
1182 instructions, described in the <a href="Atomics.html">atomics guide</a>.
Devang Pateldbf83832008-10-14 20:03:43 +0000[diff] [blame]1183</ul>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1184
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1185<h4>Windows (32-bit)</h4>
1186<div>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1187
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1188<ul>
1189 <li>On Win32(MinGW32 and MSVC), Windows 2000 will not be supported.
1190 Windows XP or higher is required.</li>
1191</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1192
NAKAMURA Takumi2b462b52011-08-22 23:22:05 +0000[diff] [blame]1193</div>
1194
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1195</div>
1196
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1197<!--=========================================================================-->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1198<h3>
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1199<a name="api_changes">Internal API Changes</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1200</h3>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1201
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1202<div>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1203
Chris Lattnerc3a2c982011-04-06 00:45:11 +0000[diff] [blame]1204<p>In addition, many APIs have changed in this release. Some of the major
Bill Wendling46ffaa92011-08-02 06:20:17 +0000[diff] [blame]1205 LLVM API changes are:</p>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1206
1207<ul>
Benjamin Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]1208 <li>The biggest and most pervasive change is that llvm::Types are no longer
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1209 returned or accepted as 'const' values. Instead, just pass around
Benjamin Kramera02af612011-11-25 21:26:00 +0000[diff] [blame]1210 non-const Types.</li>
Chris Lattner14b3b4d2011-07-18 04:56:02 +0000[diff] [blame]1211
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1212 <li><code>PHINode::reserveOperandSpace</code> has been removed. Instead, you
1213 must specify how many operands to reserve space for when you create the
1214 PHINode, by passing an extra argument
1215 into <code>PHINode::Create</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1216
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1217 <li>PHINodes no longer store their incoming BasicBlocks as operands. Instead,
1218 the list of incoming BasicBlocks is stored separately, and can be accessed
1219 with new functions <code>PHINode::block_begin</code>
1220 and <code>PHINode::block_end</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1221
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1222 <li>Various functions now take an <code>ArrayRef</code> instead of either a
1223 pair of pointers (or iterators) to the beginning and end of a range, or a
1224 pointer and a length. Others now return an <code>ArrayRef</code> instead
1225 of a reference to a <code>SmallVector</code>
1226 or <code>std::vector</code>. These include:
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1227<ul>
1228<!-- Please keep this list sorted. -->
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1229<li><code>CallInst::Create</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1230<li><code>ComputeLinearIndex</code> (in <code>llvm/CodeGen/Analysis.h</code>)</li>
1231<li><code>ConstantArray::get</code></li>
1232<li><code>ConstantExpr::getExtractElement</code></li>
Jay Foaded8db7d2011-07-21 14:31:17 +0000[diff] [blame]1233<li><code>ConstantExpr::getGetElementPtr</code></li>
1234<li><code>ConstantExpr::getInBoundsGetElementPtr</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1235<li><code>ConstantExpr::getIndices</code></li>
1236<li><code>ConstantExpr::getInsertElement</code></li>
1237<li><code>ConstantExpr::getWithOperands</code></li>
Jay Foadf4b14a22011-07-19 13:32:40 +0000[diff] [blame]1238<li><code>ConstantFoldCall</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
1239<li><code>ConstantFoldInstOperands</code> (in <code>llvm/Analysis/ConstantFolding.h</code>)</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1240<li><code>ConstantVector::get</code></li>
1241<li><code>DIBuilder::createComplexVariable</code></li>
1242<li><code>DIBuilder::getOrCreateArray</code></li>
1243<li><code>ExtractValueInst::Create</code></li>
1244<li><code>ExtractValueInst::getIndexedType</code></li>
1245<li><code>ExtractValueInst::getIndices</code></li>
1246<li><code>FindInsertedValue</code> (in <code>llvm/Analysis/ValueTracking.h</code>)</li>
Jay Foad528beda2011-07-19 14:42:50 +0000[diff] [blame]1247<li><code>gep_type_begin</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
1248<li><code>gep_type_end</code> (in <code>llvm/Support/GetElementPtrTypeIterator.h</code>)</li>
Jay Foadd1b78492011-07-25 09:48:08 +0000[diff] [blame]1249<li><code>GetElementPtrInst::Create</code></li>
1250<li><code>GetElementPtrInst::CreateInBounds</code></li>
1251<li><code>GetElementPtrInst::getIndexedType</code></li>
Jay Foad857a48a2011-07-21 14:42:51 +0000[diff] [blame]1252<li><code>InsertValueInst::Create</code></li>
1253<li><code>InsertValueInst::getIndices</code></li>
1254<li><code>InvokeInst::Create</code></li>
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1255<li><code>IRBuilder::CreateCall</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1256<li><code>IRBuilder::CreateExtractValue</code></li>
Jay Foad040dd822011-07-22 08:16:57 +0000[diff] [blame]1257<li><code>IRBuilder::CreateGEP</code></li>
1258<li><code>IRBuilder::CreateInBoundsGEP</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1259<li><code>IRBuilder::CreateInsertValue</code></li>
Jay Foad5bd375a2011-07-15 08:37:34 +0000[diff] [blame]1260<li><code>IRBuilder::CreateInvoke</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1261<li><code>MDNode::get</code></li>
1262<li><code>MDNode::getIfExists</code></li>
1263<li><code>MDNode::getTemporary</code></li>
1264<li><code>MDNode::getWhenValsUnresolved</code></li>
Jay Foadb992a632011-07-19 15:07:52 +0000[diff] [blame]1265<li><code>SimplifyGEPInst</code> (in <code>llvm/Analysis/InstructionSimplify.h</code>)</li>
Jay Foadbf904772011-07-19 14:01:37 +0000[diff] [blame]1266<li><code>TargetData::getIndexedOffset</code></li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1267</ul></li>
1268
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1269 <li>All forms of <code>StringMap::getOrCreateValue</code> have been remove
1270 except for the one which takes a <code>StringRef</code>.</li>
Jay Foade03f15a2011-07-14 09:19:05 +0000[diff] [blame]1271
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1272 <li>The <code>LLVMBuildUnwind</code> function from the C API was removed. The
1273 LLVM <code>unwind</code> instruction has been deprecated for a long time
1274 and isn't used by the current front-ends. So this was removed during the
1275 exception handling rewrite.</li>
Bill Wendling46ffaa92011-08-02 06:20:17 +0000[diff] [blame]1276
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1277 <li>The <code>LLVMAddLowerSetJmpPass</code> function from the C API was
1278 removed because the <code>LowerSetJmp</code> pass was removed.</li>
Bill Wendling2d3138c2011-08-03 22:18:20 +0000[diff] [blame]1279
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1280 <li>The <code>DIBuilder</code> interface used by front ends to encode
1281 debugging information in the LLVM IR now expects clients to
1282 use <code>DIBuilder::finalize()</code> at the end of translation unit to
1283 complete debugging information encoding.</li>
Devang Patel2b8acaf2011-08-15 23:00:00 +0000[diff] [blame]1284
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1285 <li>The way the type system works has been
1286 rewritten: <code>PATypeHolder</code> and <code>OpaqueType</code> are gone,
1287 and all APIs deal with <code>Type*</code> instead of <code>const
1288 Type*</code>. If you need to create recursive structures, then create a
1289 named structure, and use <code>setBody()</code> when all its elements are
1290 built. Type merging and refining is gone too: named structures are not
1291 merged with other structures, even if their layout is identical. (of
1292 course anonymous structures are still uniqued by layout).</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1293
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1294 <li>TargetSelect.h moved to Support/ from Target/</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1295
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1296 <li>UpgradeIntrinsicCall no longer upgrades pre-2.9 intrinsic calls (for
1297 example <code>llvm.memset.i32</code>).</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1298
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1299 <li>It is mandatory to initialize all out-of-tree passes too and their dependencies now with
1300 <code>INITIALIZE_PASS{BEGIN,END,}</code>
1301 and <code>INITIALIZE_{PASS,AG}_DEPENDENCY</code>.</li>
Torok Edwin52cac092011-09-30 13:07:52 +0000[diff] [blame]1302
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1303 <li>The interface for MemDepResult in MemoryDependenceAnalysis has been
1304 enhanced with new return types Unknown and NonFuncLocal, in addition to
1305 the existing types Clobber, Def, and NonLocal.</li>
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1306</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1307
Daniel Dunbarf70898a2010-10-04 20:11:41 +0000[diff] [blame]1308</div>
Chris Lattner1e4d5bc2008-10-13 17:57:36 +0000[diff] [blame]1309
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1310</div>
1311
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1312<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1313<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1314 <a name="knownproblems">Known Problems</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1315</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1316<!-- *********************************************************************** -->
1317
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1318<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1319
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1320<p>This section contains significant known problems with the LLVM system, listed
1321 by component. If you run into a problem, please check
1322 the <a href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
1323 there isn't already one.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1324
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1325<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1326<h3>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1327 <a name="experimental">Experimental features included with this release</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1328</h3>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1329
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1330<div>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1331
Misha Brukmanfa50a222004-05-12 21:46:05 +0000[diff] [blame]1332<p>The following components of this LLVM release are either untested, known to
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1333 be broken or unreliable, or are in early development. These components
1334 should not be relied on, and bugs should not be filed against them, but they
1335 may be useful to some people. In particular, if you would like to work on
1336 one of these components, please contact us on
1337 the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev
1338 list</a>.</p>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1339
1340<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1341 <li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ and
1342 XCore backends are experimental.</li>
1343
1344 <li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets other
1345 than darwin and ELF X86 systems.</li>
Chris Lattnerb911de42004-03-14 02:03:02 +0000[diff] [blame]1346</ul>
1347
1348</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1349
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1350<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1351<h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1352 <a name="x86-be">Known problems with the X86 back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1353</h3>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1354
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1355<div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1356
1357<ul>
Chris Lattner0e439c9b2011-11-17 01:42:23 +0000[diff] [blame]1358 <li>The X86-64 backend <a href="http://llvm.org/PR1740">does not yet support
1359 the <tt>va_arg</tt> LLVM IR instruction</a>. Currently, front-ends support
1360 variadic argument constructs on X86-64 by lowering them manually.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1361</ul>
1362
1363</div>
1364
1365<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1366<h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1367 <a name="ppc-be">Known problems with the PowerPC back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1368</h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1369
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1370<div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1371
1372<ul>
Roman Divacky2634d772011-10-30 07:49:04 +0000[diff] [blame]1373 <li>The PPC32/ELF support lacks PIC support.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1374</ul>
1375
1376</div>
1377
1378<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1379<h3>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1380 <a name="arm-be">Known problems with the ARM back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1381</h3>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1382
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1383<div>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1384
1385<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1386 <li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
1387 processors, thumb programs can crash or produce wrong results
1388 (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
1389
1390 <li>Compilation for ARM Linux OABI (old ABI) is supported but not fully
1391 tested.</li>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1392</ul>
1393
1394</div>
1395
1396<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1397<h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1398 <a name="sparc-be">Known problems with the SPARC back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1399</h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1400
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1401<div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1402
1403<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1404 <li>The SPARC backend only supports the 32-bit SPARC ABI (-m32); it does not
1405 support the 64-bit SPARC ABI (-m64).</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1406</ul>
1407
1408</div>
1409
1410<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1411<h3>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]1412 <a name="mips-be">Known problems with the MIPS back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1413</h3>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]1414
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1415<div>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]1416
1417<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1418 <li>64-bit MIPS targets are not supported yet.</li>
Bruno Cardoso Lopes24eb3de2008-10-25 14:56:26 +0000[diff] [blame]1419</ul>
1420
1421</div>
1422
1423<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1424<h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1425 <a name="alpha-be">Known problems with the Alpha back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1426</h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1427
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1428<div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1429
1430<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1431 <li>On 21164s, some rare FP arithmetic sequences which may trap do not have
1432 the appropriate nops inserted to ensure restartability.</li>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1433</ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1434
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1435</div>
1436
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1437<!-- ======================================================================= -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1438<h3>
Chris Lattner97beb512007-05-14 06:56:09 +0000[diff] [blame]1439 <a name="c-be">Known problems with the C back-end</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1440</h3>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1441
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1442<div>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1443
Chris Lattner086d2692010-09-29 05:34:42 +0000[diff] [blame]1444<p>The C backend has numerous problems and is not being actively maintained.
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1445 Depending on it for anything serious is not advised.</p>
Chris Lattner086d2692010-09-29 05:34:42 +0000[diff] [blame]1446
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1447<ul>
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1448 <li><a href="http://llvm.org/PR802">The C backend has only basic support for
1449 inline assembly code</a>.</li>
1450
1451 <li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
1452 C++ programs</a>, preventing intermixing between C++ compiled by the CBE
1453 and C++ code compiled with <tt>llc</tt> or native compilers.</li>
1454
1455 <li>The C backend does not support all exception handling constructs.</li>
1456
1457 <li>The C backend does not support arbitrary precision integers.</li>
Chris Lattnerb81f10e2006-11-18 07:51:14 +0000[diff] [blame]1458</ul>
1459
1460</div>
John Criswell3bdbd302005-11-08 21:11:33 +0000[diff] [blame]1461
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1462</div>
1463
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1464<!-- *********************************************************************** -->
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1465<h2>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1466 <a name="additionalinfo">Additional Information</a>
NAKAMURA Takumi64835132011-04-18 01:17:51 +0000[diff] [blame]1467</h2>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1468<!-- *********************************************************************** -->
1469
NAKAMURA Takumi3ad28282011-04-21 01:52:00 +0000[diff] [blame]1470<div>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1471
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1472<p>A wide variety of additional information is available on
1473 the <a href="http://llvm.org/">LLVM web page</a>, in particular in
1474 the <a href="http://llvm.org/docs/">documentation</a> section. The web page
1475 also contains versions of the API documentation which is up-to-date with the
1476 Subversion version of the source code. You can access versions of these
1477 documents specific to this release by going into the "<tt>llvm/doc/</tt>"
1478 directory in the LLVM tree.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1479
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1480<p>If you have any questions or comments about LLVM, please feel free to contact
Bill Wendling16133782011-10-26 18:46:16 +0000[diff] [blame]1481 us via the <a href="http://llvm.org/docs/#maillist"> mailing lists</a>.</p>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1482
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1483</div>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1484
1485<!-- *********************************************************************** -->
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1486
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1487<hr>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1488<address>
Misha Brukman8834af92003-12-21 22:53:21 +0000[diff] [blame]1489 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman86242e12008-12-11 17:34:48 +0000[diff] [blame]1490 src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1491 <a href="http://validator.w3.org/check/referer"><img
Misha Brukman86242e12008-12-11 17:34:48 +0000[diff] [blame]1492 src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1493
Chris Lattnere0c1df42007-05-18 00:44:29 +0000[diff] [blame]1494 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1495 Last modified: $Date$
Misha Brukman68aab3b2003-11-22 01:23:39 +0000[diff] [blame]1496</address>
Chris Lattner3d482502003-10-02 04:57:28 +0000[diff] [blame]1497
Misha Brukman80731b92003-11-22 00:38:41 +0000[diff] [blame]1498</body>
1499</html>